Knife-sharpener.



PATENTED APR. 10, 1906.

A. L. DAVIS. KNIFE SHARPENER. APPLICATION FILED JUNB,'B.1905.

g-wuc 11- 601 jdbgykh. Dams ALBERT L. DAVIS, OF GRAND RAPIDS, MICHIGAN.

KNlFE-SHARFENER.

Specification of Letters Patent.

Patented April 10, 19064 Application filed June 8, 1905- Serial No. 64,221-

To all whom it may concern/.-

Be it known that I, ALBERT L. DAVIS, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Knife-Sharpeners and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. My invention relates to improvements in knife sharpeners, and more particularly to manuallyoperated devices for sharpening the knives of paper-cutters, planers, and

other like knives; and its objectwis to provide a device having a rotary grinding-wheel ada ted to engage and traverse the edge of a kni e, to provide a device that can be ap lied to a knife without detaching the knife om the machine to which it belongs, to provide improved means for rotating the grinding- Wheel, to provide a simple and effective manually-operated rotary grinder, and to provide the device with various novel features hereinafter more fully described, and particularly pointed out in theclaims.

My device consists, essentially, of a carriage, on which is mounted a rotary spindle provided with two pulleys, an idler-pulley to each pulley on the spindle, bow-strings eX- tending around the pulleys and idlers and thence in opposite directions and also held stationary at the ends, and a grinding-wheel mounted on the spindle, together with means for holding the device relative to a knife, means for holding the ends of the bow-strings, ways traversed by the carriage and arranged parallel with the edge of the knife, and a slide for the carriage and engaging the ways, as will more fully appear by reference to the accompanying drawings, in which- Figure .1 is an elevation of a device embodying my invention; Fig. 2, a plan view of the same; Fig. 3, an enlarged detail, in vertical section, on the line 3 3 of Figs. 1 and 2; Fig. 4, an enlarged plan of the means for rotating the wheel; Fig. 5, an elevation of a part of the same; Fig. 6, a detail showing the carriage-slide, and Fig. 7 a transverse section of the same.

Like numerals refer to like parts in all of the figures.

1 represents the knife to be sharpened.

2 2 are posts provided with clamps 3 to hold the device in proper relation to the knife.

4 represents rods forming ways for the carriage to traverse. One or both of the posts are adjustable on these ways to adjust the distance between the clamps for different lengths of knives.

5 is a carriage freely movable on the ways. A hanger 6 is pivoted at its lower side to the carriage, as at 8, and is provided with a bearing 7, in which is journaled a spindle 10 provided with pulleys 11 and 11? and a flange 12, to which flange is secured by a countersunk screw a grinding wheel 13, of emery, corundum, or other like abrasive material. To adjust the face of this wheel to properly engage the bevel of the knife, I provide a slotted standard 14 on the bed-plate and a slotted arm 15 on the hanger and adjustably connect the same by a bolt 16. To adjust the face of the wheel to the knife, I provide a slide 19, traversing the ways 4, on which slide the carriage is slidable transversely of the ways, and oppositely-extended bars 21 on this slide are provided with adjusting screws 22, engaging and traversing the ways, whereby the carriage-is adjusted and guided, so as to properly adjust the face of the wheel to the knife and at the same time permit the carriage to both approach the knife and to traverse the ways.

To rotate the Wheel, I provide a bow-string 17, extending nearly around an idler 23, ournaled on the hanger, and thence nearly around the pulley 11, and. with its ends eX- tended oppositely and secured to the posts 2 by means of clamps 18, whereby the bowstring is held tight. To counterbalance the side strains of this bow-string on the spindle and to increase the driving means, I also provide an oppositely-arranged bow-string 17, extending nearly around another idler 23 journaled on the hanger opposite the pulley 11, and thence extending nearly around the pulley 11 and thence extending oppositely to the clamps 18 and held thereby. I thus provide a driving means that will not traverse axially on the pulleys, having oppositely balanced strains 011 the spindle and also having effective frictional contact with the pulleys to drive the wheel 13. The hanger 7 is provided. with projections 9, which may be grasped by the operator to reciprocate the 1 device With the Wheel pressed against the knife.

In the event that it is desired to grind the edge of the knife to a right line the slide and carriage are secured in fixed relation by tightening the screws 20.

In some cases When applying the sharpener to a knife While in the machine-as, for instance, the knife of a papercutterthe bow-strings may be attached or clamped to any convenient part of the machineas, for instance, the vertical guides traversed by the knife and the carriage 5 traversed on the surface of the bed of the machine, in which event a slide having the ribs 21 spaced apart to fit the groove in the bed-plate of the machine could be used. So, also, if desirable to sharpen the knife of a planer for lumber the bow-strings may be attached or clamped to the frame of the machine at suitable points and the carriage 5 traversed on the bed of the machine With the Wheel 13 in contact with the planer-knife Other knives in other machines obviously may be sharpened in substantially like manner with this device.

Having thus fully described my invention, What I claim, and desire to secure by Letters Patent, is

1. The combination of a movable carriage, a hanger adjustably mounted on the carriage, a spindle journaled in the hanger, a pulley and a grinding-Wheel mounted on the spindle, a bow-string engaging the pulley and oppol sitely extended therefrom, and means for holding the ends of the boWstring stationary.

2. The combination of a movable carriage, a hanger pivoted to the carriage and having an arm and journal-bearing, a spindle rotative in the bearing, a pulley and a grinding- Wheel on the spindle, a slotted standard on the carriage, a bolt connecting the arm and standard, and a bow-string engaging the pulley and oppositely extended therefrom.

3. The combination of a carriage, a hanger pivoted at its, lower side to the carriage, a

slotted arm and a journal bearing onthe hanger, a slotted standard on the carriage, a 1 bolt connecting the arm and standard, a l spindle rotative in the bearing, a pulley and a flange on the spindle, a grinding-Wheel attached to the spindle, a bow-string engaging l the pulley and oppositely extended therefrom,

and means for holding the ends of the bow- 1 string.

4. The combination of a carriage, a hanger adjustably dle journaled in the hanger, a pulley and a grinding-Wheel 011 the spindle, Ways traversed by the carriage, standards on the Ways, clamps on the standard to engage a knife, a bow-string engaging the pulley and oppositely extended therefrom, and clamps on the standards to hold the bow-string.

5. The combination of a carriage, a hanger pivoted to the carriage, an arm and a journalbearing on the hanger, a slotted standard on the carriage, a bolt connecting the arm and standard, a spindle rotative in the bearing, a pulley and a grinding-wheel on the spindle, a bowstring engaging the pulley and oppoe sitely extended therefrom, Ways traversed by the carriage, standards adjustable on the Ways, clamps on the standards to engage a knife, and clamps on the standards to hold the bow-string.

mounted on the carriage, a spin- 6. The combination of a carriage, Ways traversed by the carriage, a slide attached to the carriage and traversing the Ways, a spindle mounted on the carriage, a grinding-Wheel on which the carriage is movable, Ways traversed by the carriage and slide, a spindle mounted on the carriage, a pulley and a grinding-Wheel on the spindle, a bow-string engaging the pulley, and oppositely extended, and means for holding the respective ends of the bow-string stationary.

8. In a grinder, the combination of a carriage, a spindle mounted on the carriage, a grinding-Wheel, and a pulley on the spindle, an idler-pulley near. the spindle-pulley, a bowstring engaging the said pulleys and thence extended in opposite directions, and means for holding the respective ends of the bowstring stationary.

9. In a grinder, the combination of a spindle, two pulleys on the spindle, an idler-pulley opposite each spindle-pulley, bow-strings extending nearly around the respective idlerpulley and spindle-pulley and thence oppositely, and means for holding the respective ends of the bow-strings stationary.

In testimony whereof I affix my signature in presence of tWo Witnesses.

ALBERT L. DAVIS.

Witnesses:

LUTHER V. MoULToN, GEORGIANA CHAOE. 

